This function sets the initial velocity or the random velocity of released particles.

Syntax

• void SetVelocity(float x, float y, const flost& z, int index=0, const bool global=false)

Parameters

• x: - specified velocity along the x-axis
• y: - specified velocity along the y-axis
• z: - specified velocity along the z-axis
• index: - differentiates between setting initial velocity or random velocity. 0 = initial velocity, 1 = random velocity.
• global: if set to true, emitted particle velocity will be calculated in global space instead of local space.

Remarks

Starting velocity is calculated as follows: StartVelocity = velocity[0] + Random(-.5*velocity[1], .5*velocity[1])

Example

#include "Leadwerks.h"

using namespace Leadwerks;

int main(int argc, const char *argv[])
{
    float time = 0.5;

    Leadwerks::Window* window = Leadwerks::Window::Create();
    Context* context = Context::Create(window);
    World* world = World::Create();
    Camera* camera = Camera::Create();
    camera->SetRotation(35, 0, 0);
    camera->Move(0, 0, -3);

    //Create an emitter
    Emitter* emitter = Emitter::Create(100);

    int timercount = 0;

    while (true)
    {
        if (window->Closed() || window->KeyDown(Key::Escape)) return false;

        Leadwerks::Leadwerks::Time::Update();
        world->Update();
        world->Render();

        if (++timercount % 100 == 0)
        {
            emitter->SetVelocity(Math::Random(-1, 1), Math::Random(-1, 1), Math::Random(-1, 1), 0);
            emitter->SetVelocity(Math::Random(-1, 1), Math::Random(-1, 1), Math::Random(-1, 1), 1);
        }

        context->SetBlendMode(Blend::Alpha);
        context->DrawText("Current Base Velocity: " + (emitter->GetVelocity(0)).ToString(), 2, 2);
        context->DrawText("Current Random Velocity: " + (emitter->GetVelocity(1)).ToString(), 2, 20);
        context->SetBlendMode(Blend::Solid);

        context->Sync();
    }
}